In the Software description I saw that Open Labs generate a Checksum for every file within Open Labs.

This Info I got from the Agilent Documentation PDF

OpenLAB CDS automatically calculates and stores checksums for your Custom Calculation files. If the checksum is wrong or missing, something has been changed outside of OpenLAB, and changes are not tracked in any OpenLAB audit trail. To avoid inconsistencies, OpenLAB CDS does not load such custom calculation files.

The XML Connectivity Guide (OpenLAB CDS ChemStation XML Connectivity Guide ) is only applicable to OpenLAB CDS ChemStation software and is not relevant to OpenLAB CDS 2.1 which is the software you stated your were using in your reply.